- Joined
- Oct 14, 2014
- Messages
- 2,114
That old motor is extremely well made, should last forever. Only thing you might double check is the bearings. With no belt attached, spin it by hand. If it runs smooth and quiet they are fine. This is about the only thing that can break on them.
I also have a a two speed motor on a VFD. This one runs either 1800 or 3600, yours may be different. Especially since you mention it is huge. Lower RPM motors have more mass.
Anyway, I leave mine wired on the low speed for more torque. Then run the VFD from 30 Hz to 130 Hz to give motor speeds from 900 to 4000 RPM
I also have a a two speed motor on a VFD. This one runs either 1800 or 3600, yours may be different. Especially since you mention it is huge. Lower RPM motors have more mass.
Anyway, I leave mine wired on the low speed for more torque. Then run the VFD from 30 Hz to 130 Hz to give motor speeds from 900 to 4000 RPM